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Results from the ELISA test performed on SW620 human colon cancer cells exposed to 3 mM 5-ALA or met-ALA and 4.5 J/cm2 light or left without light treatment and in control cells (no precursor, no light) or light only. A significant increase in IGF-2 concentration was found after photodynamic therapy (PDT) and light only (p < 0.05). Data are presented as the means with 5% statistical error from two experiments; ir, irradiation.
